Can a general purpose receptacle be placed above an office type building...receptacle serves wireless module. JM
There is a detailed thread on this exact topic.
You can place the receptacle above a dropped ceiling. But then you cannot plug a flexible cord into it.
hmy:
You can plug a wall wart type class 2 power supply directly into the outlet and with certain very detailed restrictions you can plug in the non-detachable power cord of certain types of equipment, including wireless routers.
If the space above the ceiling is an air handling area (not a plenum under the NEC definition), then the restrictions get even tighter.